94. Absorption in condensers, measurement of residual. Astatic ballistic galvanometer, description of combinations of needles in galvanometers B PAGE 169 121 370 282, 285 272 Balance, description of Hughes' induction magnetic 356 355 determination of relative inductivities by Hughes' induction 143 magnetic 160 Balance, standard direct-reading electric, description of 274-278 method 141 45. 83. Ballistic galvanometer, calibration of, by standard magneto-inductor 81. Ballistic galvanometer, calibration of, by standard solenoid method 138 69. Ballistic galvanometer, determination of apparent increase of re- Ballistic galvanometer, proofs of formulæ in calibrations of . 135 46. 49. method Battery, internal resistance, measurement by fall of potential method secondary 337 TEST NO. 39. Bridge wire, calibration by Carey-Foster's method of a metre Cahart-Clark standard cell, description of Calorimeter, description of a form of electro- 106. Capacities in series and parallel, laws of combination of proof of laws of combination proof of formulæ for the comparison of . . . 96. Capacity, comparison of, ballistically by direct deflection method. 340 350 190 248 243 176 186 187 secohmmeter method 178 Siemens's continued subtraction 185 IOI. Capacity, comparison of, by Thomson's (Lord Kelvin's) method 99. Capacity, comparison of, the Wheatstone bridge method introductory to absolute and comparative determinations (specific inductive) of dielectrics, measurement of Carbon megohm. 314 66. Clark standard cell, preparation of Clark's cells, table of E. M. F.'s at different temperatures of discharge, relation between "time constant " and current 94. Condensers, determination of leakage, absorption, and residual TEST NO. Constants, useful Copper voltameter, description of PAGE 366 332 73. method of finding the constant of an ammeter 121 148 35. Current and amount of heat generated, relation between 72. Current measuring instruments, standardization by silver voltameter 119 57 5. 6. Damping coil, description of D D'Arsonval galvanometers, description of Data, useful, and constants, table of I 349 286 366 Decrement, the Napierian logarithmic Deposits of various metals, table of electrolytic . Differences of potential, best way to obtain the ratio of two Differential galvanometers, description of Dimensions of electrostatic capacity 59. Electromotive forces, comparison by Clark-Poggendorff method condenser or ballistic directions for use and setting up reversing key Earth coil, description of the Electro-calorimeter, description of a form of Electro-chemical equivalents of metals, table of . 74. Electrolytes, conductivity and specific resistance by the Stroud- 76. Electrolytes, resistance of, by the Kohlrausch method resistance cells, description of form for use with Kohl- rausch bridge. . Electrolytic resistance cells, description of the Stroud-Henderson. Electrometer, Carpentier quadrant, description of 359 350 364 124 128 129 364 346 243 289 300 298 290 96 98 Electromotive forces, proofs of formulæ for various methods of 64. E.M.F. and internal resistance of a cell, effect of size and distance comparison E.M.F. of Clark cells at different temperatures, table of PAGE 94 92 ΙΟΙ 102 233-237 104 364 364 339 338 43. Galvanometer resistance, measurement by Thomson's method 74 227, 228 282, 285 Thomson high-resistance astatic, description of Gas voltameter, description of mixed . Gauss, the "A" position of 284 . 271 331 14, 149, 219, 241 TEST NO. H "H" the horizontal component of the earth's magnetism by 35. Heat generated by an electric current, measurement of . PAGE 22 57 116 358 356 355 determination of relative magnetic quali- 91. ties by 86. Hysteresis and permeability, magnetic, introductory to measurements 160 145 162 165 I 6. Induction balance, description of the Hughes' magnetometer, measurement of magnetic dip by. 85. Inductivities of materials, determination of, by Hughes' induction Inductor, description of Hibbert's standard magneto- 27. Insulation resistance by loss of charge, electrometer method 26. employing shunts of condensers by loss of charge Internal resistance of battery, measurement by Beetz's method 219-256 46 galvanometer 44 method, proof of formula 226 48 leaky condensers by loss of charge methods, 49 81 condenser 86 87 Internal resistance of battery, measurement by fall of potential method proofs of formulæ for various methods variation of, with size, etc. j 36. Joule's equivalent, determination (electrically) of half-deflection 77 79 82 228-233 364 104 84 59 |